Spline shaft 1 rotates about fixed axis A-A. Coaxial shafts 3 and 4 with friction disks a and b rotate about fixed axes B and C. By means of device 7 (shown schematically), friction wheel 2 can be shifted along the splines of shaft 1 so that it contacts disks a and b at points above or below axes B and C. Thus wheel 2 transmits rotation to disks a and b (and shafts 3 and 4) in opposite and reversible directions. Disks a and b are pressed against wheel 2 by screws 5 and 6.
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